Light bulb



FIG. 1 is a perspective view of light bulb showing my present design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view of a light bulb, showing my present design in other angle; 

CLAIM The ornamental design for a light bulb, as shown and described. 